Reduction of total time by activation analysis in steels using the stripping spectrum techniques
Creators
- 1. Prefeitura da Cidade do Recife (Brazil)
- 2. Pernambuco Univ., Recife (Brazil). Dept. de Energia Nuclear
Description
The authors have shown the feasibility of neutron activation analysis with simple equipment (isotopic neutron source and NaI(Tl) gamma spectrometr with single-channel analyser) to the determination of V, Mn and W in steels. The duration of each analysis was long (5,5 h), so that the counts due to Mn-56 and W-187 could be separated by least-square techniques. Tests showed that the equipment available could be adapted to the technique of 'spectrum stripping', thus rendering possible the assessment of the contribution of the Mn-56 in the region of the spectrum in which it appeared combined to the W-187, from the counts at the 847 KeV peak of Mn-56. It was then possible, with just two measurements, to determine the counts due to the W-187, thus reducting the total time for analysis to less than 3 h, without affecting significantly the precision and accuracy of the results. (Author)
Abstract (Portuguese)
Foi demonstrada a viabilidade do emprego da analise por ativacao com equipamento simples (fonte isotopica de neutrons e sistema de espectrometria gama a cristal de NaI(Tl) com analisador monocanal) para a determinacao dos teores de V, Mn e W em acos. O tempo de analise era longo (5,5 h por amostra), para que pudesse ser feita a separacao das contagens do Mn-56 e do W-187 pelo metodo dos minimos quadrados. Testes mostraram que era possivel, com o equipamento que se dispunha, adaptar a tecnica de 'spectrum stripping' a metodologia adotada, determinando-se a contribuicao do Mn-56 na faixa do espectro em que ele aparecia combinado ao W-187, com base no fotopico de 847 KeV do Mn-56. Com apenas duas medidas tornou-se possivel determinar as contagens devido ao W-187, reduzindo o tempo de analise a menos de 3 h, sem grande prejuizo para a precisao e a exatidao dos resultados. (Autor)Additional details
Additional titles
- Original title (Portuguese)
- A reducao do tempo total de analise por ativacao em acos pela tecnica de 'spectrum stripping'
Publishing Information
- Imprint Title
- Proceedings of the 1. General Congress of Nuclear Energy. v. 1
- Imprint Pagination
- 430 p.
- Journal Page Range
- v. 1 p. 109-112.
- Report number
- INIS-BR--537(v.1)
Conference
- Title
- 1. General Congress of Nuclear Energy.
- Dates
- 17-20 Mar 1986.
- Place
- Rio de Janeiro, RJ (Brazil).
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 17067378
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- MANGANESE 56; MEASURING INSTRUMENTS; NEUTRON ACTIVATION ANALYSIS; OPTIMIZATION; STEELS; TUNGSTEN 187
- Descriptors DEC
- ACTIVATION ANALYSIS; ALLOYS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON ADDITIONS; CHEMICAL ANALYSIS; DAYS LIVING RADIOISOTOPES; EVEN-ODD NUCLEI; HEAVY NUCLEI; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; IRON ALLOYS; IRON BASE ALLOYS; ISOTOPES; MANGANESE ISOTOPES; NONDESTRUCTIVE ANALYSIS; NUCLEI; ODD-ODD NUCLEI; RADIOISOTOPES; TUNGSTEN ISOTOPES
Optional Information
- Notes
- Imprint:Anais do 1. Congresso Geral de Energia Nuclear. v. 1.